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From: Jason Rumney <jasonr@gnu.org>
To: Chong Yidong <cyd@stupidchicken.com>
Cc: emacs-devel@gnu.org
Subject: Re: "Bold" effect when anti-aliased glyphs are overwritten
Date: Tue, 27 May 2008 22:18:51 +0100	[thread overview]
Message-ID: <483C7ABB.50604@gnu.org> (raw)
In-Reply-To: <87ve0zmy8p.fsf@stupidchicken.com>

Chong Yidong wrote:
> Currently, the foreground of these redrawn glyphs is drawn directly
> without erasing the existing glyph.  This is because we generally don't
> want to redraw the background, since that might in turn overwrite THIS
> glyph's neighbors.  Without anti-aliasing, this procedure is obviously
> unproblematic.
>   
The usual way to solve such problems is to use clipping to only erase 
and draw the parts of the neighboring glyphs that need redrawing.
I thought I had seen such code when porting the new font backend to 
Windows, but perhaps I am misremembering.





  parent reply	other threads:[~2008-05-27 21:18 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-27 17:51 "Bold" effect when anti-aliased glyphs are overwritten Chong Yidong
2008-05-27 21:09 ` Chong Yidong
2008-05-28  8:49   ` Stephen Berman
2008-05-27 21:18 ` Jason Rumney [this message]
2008-05-27 21:21   ` Chong Yidong
2008-05-28  2:21     ` Kenichi Handa
2008-05-28  0:30 ` Kenichi Handa

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